Druid adapter: Send timestamp literals to Druid as local time, not UTC

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Description

In the Druid adapter, send timestamp literals to Druid as local time, not UTC. Druid will interpret them as instants in the Druid server's time zone. In SQL (and therefore in Calcite), timestamps do not have a time zone; in Joda-Time's terminology they represent a LocalDateTime rather than an Instant.

In the following, "1999-11-10T00:00:00.000Z" should be "1999-11-10T00:00:00.000".